Combination switch and alarm



T. W.4MCKENZ|E.

COMBINATION SWITCH AND ALARM.

`APPL|cATioN FILED MAY 27. |920.,

' 1,408,619, Patented Mar. 7,-1922.

/8 wie 'mi UNITED STATES THOMAS WILLIAM MGKENZIL, CALGARY, ALBERTA, `CAN ADA.

COMBIATION SWITCH AND ALARM.

Application filed May 27, 1920. Serial' No. 384,763.

T0 all wlw/m, it may concern.'

Be it known that I, THoMAs VVILLIAH lIoKnNZIn, of the city of Calgary, in the Province of Alberta, Canada, have invented certain new and useful Improvements in a Combination Switch and Alarm, of which the following is a specification.

The object of my invention is to provide a combination switch that can be used only by an authorized person and one which if tampered with will sound an alarm.

I accomplish this by the device illustrated in the accompanying drawings in which- Fig. 1 is a front view of the face plate showing the operating mechanisms.

Fig. 2 is a view with the front cover plate removed showing the various mechanisms and a wiring arrangement.

Fig. 3 is a top view.

Fig. 4t is a vertical cross' section showing the method of mounting the combination discs.

Fig. 5 is a view of the switch lever.

Similar numbers refer to similar parts throughout the several views.

Ignition contact points 1 and 2 are mounted upon an insulating medium 3 and are insulated individually, a contact maker 5, is formed upon a rod 6, pivoted in both walls of the switch box and in relation to the said contact points the lever terminating at a face plate 7 in a switch lever 8. This switch lever is provided with an ordinary ratchet so as to give a one way motion. Electrical connections are made to each of these contact points and energy passes to the ignition system 9 shewn in broken lines in Fig. 2.

To prevent the unauthorized use of this switch two discs 10 and 11 are provided, the

`disc 1 0 being rigidly mounted upon an axle 12 and the disc 11 being loosely mounted upon an insulating bushing upon the said axle and being kept separated from the disc 10 by a collar 13, rigidly mounted pins 1& L being provided in the faces of each of the said discs 10 and 11 which engage one another so as to rotate the said discs for setting purposes, an index dial 15 is secured to the axle 12, adj acent to the face plate T, the rotation of which dial also rotates the disc 1() through the movement of the shaft 12.

The discs 10 and 11 have mounted thereon circular electrodes 1G, and are connected to an alarm circuit by a spring contact 18 engaging their periphery.' Slots 19 are provided in each disc, that in the electrodes Specification of Letters latenti .retreated Mar. "7, 192e.

16 being slightly wider than that inthe insulation discs 10 and 11, for the purpose of allowing a bent lever 2O to move into the said slots without closing the alarm circuit. This lever 20 is mounted between the walls of the box and connected to the alarm circuit 17, and is operated by a projection 21, formed upon the pivoted rod 6, to close the alarm circuit when the disc combination is improperly set the curvature of the lever being such as to limit the movement of the switch 8. A lever 22, pivoted on one of the walls of the switch box engages the upper end of the bent lever 2O and is provided with a curved leg 23, which is engaged by a cam 24:, formed upon the rod 6 lor the purpose of bringing the bent lever 20 clear of the combination discs.

From the foregoing description it will be observed that to operate the ignition circuit it is necessary that the combination discs should be set in their proper relation by a pre-determined rotation ofthe index dial 15 so as to bring the slots 19 in the said discs opposite to one another and allow movement of the switch lever 8 so as to bring the contact maker 5 between the contact points 1 and 2.

Vhen opening the ignition circuit the combination discs are moved out of position and the switch lever is given a partial turn.

Unauthorized users cannot now close the ignition circuit but upon turning the switch lever 8 cause the bent lever 2O to engage the periphery of the electrodes 16 and close the alarm circuit. As the switch lever 8 can only turn in one direction and cannot pass the bent lever 20 unless the combination discs are properly set, the alarm continues to ring until the authorized person arrives and sets the combination whereupon the lever 22 is engaged by the cam 211 upon the switch rod 6 and brings the bent lever 20 back to its normal position, allowing the switch lever to be brought around so as to close the ignition circuit.

IVhat I claim as my invention is:

In an article of the class described a rotor mounted rigidly upon a central shaft which shaft extending through a face place has a visible index plate rigidly mounted thereon, a plurality of rotors mounted loosely upon insulating' bushings upon the said central shaft and distant from one another, engaging `means between the individual rotors in relation to slots formed in the peripheries of i the said rotors to cause the slots to register ed when in Contact with the said electrodes 10 to engage Within all the slots in the plurality of rotors at one and the same time.

Signed at Calgary this 17th day of May,

THOMAS VILLIAM MCKENZIE.

In the presence of ERIC L. HARVIE, VIOLET AYLING. 

